JAMB - Biology (1982 - No. 10)
A married couple has 10 children and they are all girls. Which of the following is the CORRECT explanation?
The woman is incapable of producing male children
The man’s sperms are very weak
The man is not athletic enough
The Y component of the men’s sex chromosomes was always involved
The X component of the man’s sex chromosomes was always involved
Explanation
The sperm carries either an X or Y chromosome, and the egg always carries an X. If the sperm carrying an X chromosome fertilizes the egg, the child will be XX, female. If the sperm carrying a Y chromosome fertilizes the egg, the child will be XY, male. Therefore there is most likely that the X component of the man’s sex chromosomes was always involved during the fertilization process.
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